Merge pull request #2000 from jepler/nrf-pwm-audio

Implement PWM audio out for the nrf port

35 files changed, 1096 insertions, 80 deletions

diff --git a/locale/ID.po b/locale/ID.po
index bd12a5c94..2b8f5a91c 100644
--- a/locale/ID.po
+++ b/locale/ID.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -255,6 +255,7 @@ msgstr "Semua timer untuk pin ini sedang digunakan"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -329,6 +330,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr ""
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr ""
@@ -951,6 +957,7 @@ msgid "Not connected"
 msgstr "Tidak dapat menyambungkan ke AP"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr ""
 
@@ -1080,6 +1087,7 @@ msgid "Sample rate must be positive"
 msgstr ""
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Nilai sampel terlalu tinggi. Nilai harus kurang dari %d"
diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 1b135822f..b872fa74d 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -253,6 +253,7 @@ msgstr ""
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -325,6 +326,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr ""
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr ""
@@ -935,6 +941,7 @@ msgid "Not connected"
 msgstr ""
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr ""
 
@@ -1060,6 +1067,7 @@ msgid "Sample rate must be positive"
 msgstr ""
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr ""
diff --git a/locale/de_DE.po b/locale/de_DE.po
index 7ad69e1dd..9d1b5fec7 100644
--- a/locale/de_DE.po
+++ b/locale/de_DE.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: Pascal Deneaux\n"
 "Language-Team: Sebastian Plamauer, Pascal Deneaux\n"
@@ -255,6 +255,7 @@ msgstr "Alle timer für diesen Pin werden bereits benutzt"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -329,6 +330,11 @@ msgstr "Die Helligkeit ist nicht einstellbar"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Der Puffergröße ist inkorrekt. Sie sollte %d bytes haben."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Der Puffer muss eine Mindestenslänge von 1 haben"
@@ -948,6 +954,7 @@ msgid "Not connected"
 msgstr "Nicht verbunden"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "Spielt nicht"
 
@@ -1077,6 +1084,7 @@ msgid "Sample rate must be positive"
 msgstr "Abtastrate muss positiv sein"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Abtastrate zu hoch. Wert muss unter %d liegen"
diff --git a/locale/en_US.po b/locale/en_US.po
index 49699283c..e98c863fd 100644
--- a/locale/en_US.po
+++ b/locale/en_US.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -253,6 +253,7 @@ msgstr ""
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -325,6 +326,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr ""
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr ""
@@ -935,6 +941,7 @@ msgid "Not connected"
 msgstr ""
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr ""
 
@@ -1060,6 +1067,7 @@ msgid "Sample rate must be positive"
 msgstr ""
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr ""
diff --git a/locale/en_x_pirate.po b/locale/en_x_pirate.po
index 885abe681..bf603384f 100644
--- a/locale/en_x_pirate.po
+++ b/locale/en_x_pirate.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: \n"
 "Language-Team: @sommersoft, @MrCertainly\n"
@@ -255,6 +255,7 @@ msgstr ""
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -329,6 +330,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr ""
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr ""
@@ -939,6 +945,7 @@ msgid "Not connected"
 msgstr ""
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr ""
 
@@ -1064,6 +1071,7 @@ msgid "Sample rate must be positive"
 msgstr ""
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr ""
diff --git a/locale/es.po b/locale/es.po
index 772570a31..0e24fc835 100644
--- a/locale/es.po
+++ b/locale/es.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-08-24 22:56-0500\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -257,6 +257,7 @@ msgstr "Todos los timers para este pin están siendo utilizados"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -333,6 +334,11 @@ msgstr "El brillo no se puede ajustar"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Tamaño de buffer incorrecto. Debe ser de %d bytes."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Buffer debe ser de longitud 1 como minimo"
@@ -950,6 +956,7 @@ msgid "Not connected"
 msgstr "No conectado"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "No reproduciendo"
 
@@ -1088,6 +1095,7 @@ msgid "Sample rate must be positive"
 msgstr "Sample rate debe ser positivo"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Frecuencia de muestreo demasiado alta. Debe ser menor a %d"
diff --git a/locale/fil.po b/locale/fil.po
index 8e4dbd9fd..ac010aee6 100644
--- a/locale/fil.po
+++ b/locale/fil.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-12-20 22:15-0800\n"
 "Last-Translator: Timothy <me@timothygarcia.ca>\n"
 "Language-Team: fil\n"
@@ -257,6 +257,7 @@ msgstr "Lahat ng timers para sa pin na ito ay ginagamit"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -331,6 +332,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Mali ang size ng buffer. Dapat %d bytes."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Buffer dapat ay hindi baba sa 1 na haba"
@@ -960,6 +966,7 @@ msgid "Not connected"
 msgstr "Hindi maka connect sa AP"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "Hindi playing"
 
@@ -1093,6 +1100,7 @@ msgid "Sample rate must be positive"
 msgstr "Sample rate ay dapat positibo"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Sample rate ay masyadong mataas. Ito ay dapat hindi hiigit sa %d"
diff --git a/locale/fr.po b/locale/fr.po
index 5bb51b622..1a2bb90b3 100644
--- a/locale/fr.po
+++ b/locale/fr.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 0.1\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2019-04-14 20:05+0100\n"
 "Last-Translator: Pierrick Couturier <arofarn@arofarn.info>\n"
 "Language-Team: fr\n"
@@ -260,6 +260,7 @@ msgstr "Tous les timers pour cette broche sont utilisés"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -336,6 +337,11 @@ msgstr "Luminosité non-ajustable"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Tampon de taille incorrect. Devrait être de %d octets."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Le tampon doit être de longueur au moins 1"
@@ -969,6 +975,7 @@ msgid "Not connected"
 msgstr "Non connecté"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "Ne joue pas"
 
@@ -1110,6 +1117,7 @@ msgid "Sample rate must be positive"
 msgstr "Le taux d'échantillonage doit être positif"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Taux d'échantillonage trop élevé. Doit être inf. à %d"
diff --git a/locale/it_IT.po b/locale/it_IT.po
index 2f8cfdc1e..ccf395846 100644
--- a/locale/it_IT.po
+++ b/locale/it_IT.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-10-02 16:27+0200\n"
 "Last-Translator: Enrico Paganin <enrico.paganin@mail.com>\n"
 "Language-Team: \n"
@@ -256,6 +256,7 @@ msgstr "Tutti i timer per questo pin sono in uso"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -331,6 +332,11 @@ msgstr "Illiminazione non è regolabile"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Buffer di lunghezza non valida. Dovrebbe essere di %d bytes."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Il buffer deve essere lungo almeno 1"
@@ -959,6 +965,7 @@ msgid "Not connected"
 msgstr "Impossible connettersi all'AP"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "In pausa"
 
@@ -1098,6 +1105,7 @@ msgid "Sample rate must be positive"
 msgstr "STA deve essere attiva"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr ""
diff --git a/locale/pl.po b/locale/pl.po
index 83e408a3d..3a8b7c530 100644
--- a/locale/pl.po
+++ b/locale/pl.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2019-03-19 18:37-0700\n"
 "Last-Translator: Radomir Dopieralski <circuitpython@sheep.art.pl>\n"
 "Language-Team: pl\n"
@@ -254,6 +254,7 @@ msgstr "Wszystkie timery tej nóżki w użyciu"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -328,6 +329,11 @@ msgstr "Jasność nie jest regulowana"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Zła wielkość bufora. Powinno być %d bajtów."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Bufor musi mieć długość 1 lub więcej"
@@ -945,6 +951,7 @@ msgid "Not connected"
 msgstr "Nie podłączono"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "Nic nie jest odtwarzane"
 
@@ -1070,6 +1077,7 @@ msgid "Sample rate must be positive"
 msgstr "Częstotliwość próbkowania musi być dodatnia"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Zbyt wysoka częstotliwość próbkowania. Musi być mniejsza niż %d"
diff --git a/locale/pt_BR.po b/locale/pt_BR.po
index d3a8fe50a..0bc5d0613 100644
--- a/locale/pt_BR.po
+++ b/locale/pt_BR.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2018-10-02 21:14-0000\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -256,6 +256,7 @@ msgstr "Todos os temporizadores para este pino estão em uso"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -328,6 +329,11 @@ msgstr ""
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Buffer de tamanho incorreto. Deve ser %d bytes."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr ""
@@ -951,6 +957,7 @@ msgid "Not connected"
 msgstr "Não é possível conectar-se ao AP"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr ""
 
@@ -1080,6 +1087,7 @@ msgid "Sample rate must be positive"
 msgstr ""
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Taxa de amostragem muito alta. Deve ser menor que %d"
diff --git a/locale/zh_Latn_pinyin.po b/locale/zh_Latn_pinyin.po
index 055dd5461..74eed5231 100644
--- a/locale/zh_Latn_pinyin.po
+++ b/locale/zh_Latn_pinyin.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: circuitpython-cn\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-07-25 22:48-0700\n"
+"POT-Creation-Date: 2019-07-31 16:30-0500\n"
 "PO-Revision-Date: 2019-04-13 10:10-0700\n"
 "Last-Translator: hexthat\n"
 "Language-Team: Chinese Hanyu Pinyin\n"
@@ -255,6 +255,7 @@ msgstr "Cǐ yǐn jiǎo de suǒyǒu jìshí qì zhèngzài shǐyòng"
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #: ports/nrf/common-hal/pulseio/PulseOut.c shared-bindings/pulseio/PWMOut.c
 #: shared-module/_pew/PewPew.c
 msgid "All timers in use"
@@ -329,6 +330,11 @@ msgstr "Liàngdù wúfǎ tiáozhěng"
 msgid "Buffer incorrect size. Should be %d bytes."
 msgstr "Huǎnchōng qū dàxiǎo bù zhèngquè. Yīnggāi shì %d zì jié."
 
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
+#, c-format
+msgid "Buffer length %d too big. It must be less than %d"
+msgstr ""
+
 #: shared-bindings/bitbangio/I2C.c shared-bindings/busio/I2C.c
 msgid "Buffer must be at least length 1"
 msgstr "Huǎnchōng qū bìxū zhìshǎo chángdù 1"
@@ -945,6 +951,7 @@ msgid "Not connected"
 msgstr "Wèi liánjiē"
 
 #: shared-bindings/audiobusio/I2SOut.c shared-bindings/audioio/AudioOut.c
+#: shared-bindings/audiopwmio/PWMAudioOut.c
 msgid "Not playing"
 msgstr "Wèi bòfàng"
 
@@ -1075,6 +1082,7 @@ msgid "Sample rate must be positive"
 msgstr "Cǎiyàng lǜ bìxū wèi zhèng shù"
 
 #: ports/atmel-samd/common-hal/audioio/AudioOut.c
+#: ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
 #, c-format
 msgid "Sample rate too high. It must be less than %d"
 msgstr "Cǎiyàng lǜ tài gāo. Tā bìxū xiǎoyú %d"
@@ -1128,8 +1136,9 @@ msgstr ""
 msgid ""
 "The `microcontroller` module was used to boot into safe mode. Press reset to "
 "exit safe mode.\n"
-msgstr "“Wēi kòngzhì qì” mókuài yòng yú qǐdòng ānquán móshì. Àn chóng zhì kě "
-"tuìchū ānquán móshì.\n"
+msgstr ""
+"“Wēi kòngzhì qì” mókuài yòng yú qǐdòng ānquán móshì. Àn chóng zhì kě tuìchū "
+"ānquán móshì.\n"
 
 #: supervisor/shared/safe_mode.c
 msgid ""
diff --git a/ports/nrf/background.c b/ports/nrf/background.c
index 9c4f3ab27..453bc96df 100644
--- a/ports/nrf/background.c
+++ b/ports/nrf/background.c
@@ -33,6 +33,10 @@
 #include "shared-module/displayio/__init__.h"
 #endif
 
+#if CIRCUITPY_AUDIOPWMIO
+#include "common-hal/audiopwmio/PWMAudioOut.h"
+#endif
+
 static bool running_background_tasks = false;
 
 void background_tasks_reset(void) {
@@ -47,6 +51,9 @@ void run_background_tasks(void) {
     running_background_tasks = true;
     filesystem_background();
     usb_background();
+#if CIRCUITPY_AUDIOPWMIO
+    audiopwmout_background();
+#endif
 
     #if CIRCUITPY_DISPLAYIO
     displayio_refresh_displays();
diff --git a/ports/nrf/common-hal/audiopwmio/PWMAudioOut.c b/ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
new file mode 100644
index 000000000..0321b751c
--- /dev/null
+++ b/ports/nrf/common-hal/audiopwmio/PWMAudioOut.c
@@ -0,0 +1,316 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "extmod/vfs_fat.h"
+#include "py/gc.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "common-hal/audiopwmio/PWMAudioOut.h"
+#include "common-hal/pulseio/PWMOut.h"
+#include "shared-bindings/audiopwmio/PWMAudioOut.h"
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "supervisor/shared/translate.h"
+
+// TODO: This should be the same size as PWMOut.c:pwms[], but there's no trivial way to accomplish that
+STATIC audiopwmio_pwmaudioout_obj_t* active_audio[4];
+
+#define F_TARGET (62500)
+#define F_PWM (16000000)
+// return the REFRESH value, store the TOP value in an out-parameter
+// Tested for key values (worst relative error = 0.224% = 3.84 cents)
+//  8000: top = 250 refresh = 7 [ 8000.0]
+// 22050: top = 242 refresh = 2 [22038.5]
+// 24000: top = 222 refresh = 2 [24024.0]
+// 44100: top = 181 refresh = 1 [44198.8]
+// 48000: top = 167 refresh = 1 [47904.1]
+STATIC uint32_t calculate_pwm_parameters(uint32_t sample_rate, uint32_t *top_out) {
+    // the desired frequency is the closest integer multiple of sample_rate not less than F_TARGET
+    uint32_t desired_frequency = (F_TARGET + sample_rate - 1) / sample_rate * sample_rate;
+    // The top value is the PWM frequency divided by the desired frequency (round to nearest)
+    uint32_t top = (F_PWM + desired_frequency/2) / desired_frequency;
+    // The actual frequency is the PWM frequency divided by the top value (round to nearest)
+    uint32_t actual_frequency = (F_PWM + top/2) / top;
+    // The multiplier is the actual frequency divided by the sample rate (round to nearest)
+    uint32_t multiplier = (actual_frequency + sample_rate/2) / sample_rate;
+    *top_out = top;
+    return multiplier - 1;
+}
+
+STATIC void activate_audiopwmout_obj(audiopwmio_pwmaudioout_obj_t *self) {
+    for(size_t i=0; i < MP_ARRAY_SIZE(active_audio); i++) {
+        if(!active_audio[i]) {
+            active_audio[i] = self;
+            break;
+        }
+    }
+}
+STATIC void deactivate_audiopwmout_obj(audiopwmio_pwmaudioout_obj_t *self) {
+    for(size_t i=0; i < MP_ARRAY_SIZE(active_audio); i++) {
+        if(active_audio[i] == self)
+            active_audio[i] = NULL;
+    }
+}
+
+void audiopwmout_reset() {
+    for(size_t i=0; i < MP_ARRAY_SIZE(active_audio); i++)
+        active_audio[i] = NULL;
+}
+
+STATIC void fill_buffers(audiopwmio_pwmaudioout_obj_t *self, int buf) {
+    self->pwm->EVENTS_SEQSTARTED[1-buf] = 0;
+    uint16_t *dev_buffer = self->buffers[buf];
+    uint8_t *buffer;
+    uint32_t buffer_length;
+    audioio_get_buffer_result_t get_buffer_result =
+        audiosample_get_buffer(self->sample, false, 0,
+                               &buffer, &buffer_length);
+    if (get_buffer_result == GET_BUFFER_ERROR) {
+        common_hal_audiopwmio_pwmaudioout_stop(self);
+        return;
+    }
+    uint32_t num_samples = buffer_length / self->bytes_per_sample / self->spacing;
+
+    if(self->bytes_per_sample == 1) {
+        uint8_t offset = self->signed_to_unsigned ? 0x80 : 0;
+        uint16_t scale = self->scale;
+        for(uint32_t i=0; i<buffer_length/self->spacing; i++) {
+            uint8_t rawval = (*buffer++ + offset);
+            uint16_t val = (uint16_t)(((uint32_t)rawval * (uint32_t)scale) >> 8);
+            *dev_buffer++ = val;
+            if(self->spacing == 1)
+                *dev_buffer++ = val;
+        }
+    } else {
+        uint16_t offset = self->signed_to_unsigned ? 0x8000 : 0;
+        uint16_t scale = self->scale;
+        uint16_t *buffer16 = (uint16_t*)buffer;
+        for(uint32_t i=0; i<buffer_length/2/self->spacing; i++) {
+            uint16_t rawval = (*buffer16++ + offset);
+            uint16_t val = (uint16_t)((rawval * (uint32_t)scale) >> 16);
+            *dev_buffer++ = val;
+            if(self->spacing == 1)
+                *dev_buffer++ = val;
+        }
+    }
+    self->pwm->SEQ[buf].PTR = (intptr_t)self->buffers[buf];
+    self->pwm->SEQ[buf].CNT = num_samples*2;
+
+    if (self->loop && get_buffer_result == GET_BUFFER_DONE) {
+        audiosample_reset_buffer(self->sample, false, 0);
+    } else if(get_buffer_result == GET_BUFFER_DONE) {
+        self->pwm->SHORTS = NRF_PWM_SHORT_SEQEND0_STOP_MASK | NRF_PWM_SHORT_SEQEND1_STOP_MASK;
+        self->stopping = true;
+    }
+}
+
+STATIC void audiopwmout_background_obj(audiopwmio_pwmaudioout_obj_t *self) {
+    if(!common_hal_audiopwmio_pwmaudioout_get_playing(self))
+        return;
+    if(self->stopping) {
+        bool stopped =
+            (self->pwm->EVENTS_SEQEND[0] || !self->pwm->EVENTS_SEQSTARTED[0]) &&
+            (self->pwm->EVENTS_SEQEND[1] || !self->pwm->EVENTS_SEQSTARTED[1]);
+        if(stopped)
+            self->pwm->TASKS_STOP = 1;
+    } else if(!self->paused && !self->single_buffer) {
+        if(self->pwm->EVENTS_SEQSTARTED[0]) fill_buffers(self, 1);
+        if(self->pwm->EVENTS_SEQSTARTED[1]) fill_buffers(self, 0);
+    }
+}
+
+void audiopwmout_background() {
+    for(size_t i=0; i < MP_ARRAY_SIZE(active_audio); i++) {
+        if(!active_audio[i]) continue;
+        audiopwmout_background_obj(active_audio[i]);
+    }
+}
+
+void common_hal_audiopwmio_pwmaudioout_construct(audiopwmio_pwmaudioout_obj_t* self,
+        const mcu_pin_obj_t* left_channel, const mcu_pin_obj_t* right_channel, uint16_t quiescent_value) {
+    assert_pin_free(left_channel);
+    assert_pin_free(right_channel);
+    self->pwm = pwmout_allocate(256, PWM_PRESCALER_PRESCALER_DIV_1, true, NULL, NULL);
+    if(!self->pwm) {
+        mp_raise_RuntimeError(translate("All timers in use"));
+    }
+
+    self->pwm->PRESCALER = PWM_PRESCALER_PRESCALER_DIV_1;
+    // two uint16_t values per sample when Grouped
+    // n.b. SEQ[#].CNT "counts" are 2 per sample (left and right channels)
+    self->pwm->DECODER = PWM_DECODER_LOAD_Grouped;
+
+    // we use channels 0 and 2 because these are GROUPED; it lets us save half
+    // the space for sample data (no additional optimization is possible for
+    // single channel)
+    self->pwm->PSEL.OUT[0] = self->left_channel_number = left_channel->number;
+    claim_pin(left_channel);
+
+    if(right_channel)
+    {
+        self->pwm->PSEL.OUT[2] = self->right_channel_number = right_channel->number;
+        claim_pin(right_channel);
+    }
+
+    self->quiescent_value = quiescent_value >> 8;
+
+    self->pwm->ENABLE = 1;
+    // TODO: Ramp from 0 to quiescent value
+}
+
+bool common_hal_audiopwmio_pwmaudioout_deinited(audiopwmio_pwmaudioout_obj_t* self) {
+    return !self->pwm;
+}
+
+void common_hal_audiopwmio_pwmaudioout_deinit(audiopwmio_pwmaudioout_obj_t* self) {
+    if (common_hal_audiopwmio_pwmaudioout_deinited(self)) {
+        return;
+    }
+    // TODO: ramp the pwm down from quiescent value to 0
+    self->pwm->ENABLE = 0;
+
+    if(self->left_channel_number)
+        reset_pin_number(self->left_channel_number);
+    if(self->right_channel_number)
+        reset_pin_number(self->right_channel_number);
+
+    pwmout_free_channel(self->pwm, 0);
+    pwmout_free_channel(self->pwm, 2);
+
+    self->pwm = NULL;
+
+    m_free(self->buffers[0]);
+    self->buffers[0] = NULL;
+
+    m_free(self->buffers[1]);
+    self->buffers[1] = NULL;
+}
+
+void common_hal_audiopwmio_pwmaudioout_play(audiopwmio_pwmaudioout_obj_t* self, mp_obj_t sample, bool loop) {
+    if (common_hal_audiopwmio_pwmaudioout_get_playing(self)) {
+        common_hal_audiopwmio_pwmaudioout_stop(self);
+    }
+    self->sample = sample;
+    self->loop = loop;
+
+    uint32_t sample_rate = audiosample_sample_rate(sample);
+    uint32_t max_sample_rate = 62500;
+    if (sample_rate > max_sample_rate) {
+        mp_raise_ValueError_varg(translate("Sample rate too high. It must be less than %d"), max_sample_rate);
+    }
+    self->bytes_per_sample = audiosample_bits_per_sample(sample) / 8;
+
+    uint32_t max_buffer_length;
+    audiosample_get_buffer_structure(sample, /* single channel */ false,
+        &self->single_buffer, &self->signed_to_unsigned, &max_buffer_length,
+        &self->spacing);
+    if(max_buffer_length > UINT16_MAX) {
+        mp_raise_ValueError_varg(translate("Buffer length %d too big. It must be less than %d"), max_buffer_length, UINT16_MAX);
+    }
+    self->buffer_length = (uint16_t)max_buffer_length;
+    self->buffers[0] = m_malloc(self->buffer_length * 2 * sizeof(uint16_t), false);
+    if(!self->single_buffer)
+        self->buffers[1] = m_malloc(self->buffer_length * 2 * sizeof(uint16_t), false);
+
+
+    uint32_t top;
+    self->pwm->SEQ[0].REFRESH = self->pwm->SEQ[1].REFRESH = calculate_pwm_parameters(sample_rate, &top);
+    self->scale = top-1;
+    self->pwm->COUNTERTOP = top;
+
+    self->pwm->LOOP = 1;
+    audiosample_reset_buffer(self->sample, false, 0);
+    activate_audiopwmout_obj(self);
+    fill_buffers(self, 0);
+    self->pwm->SEQ[1].PTR = self->pwm->SEQ[0].PTR;
+    self->pwm->SEQ[1].CNT = self->pwm->SEQ[0].CNT;
+    self->pwm->EVENTS_SEQSTARTED[0] = 0;
+    self->pwm->EVENTS_SEQSTARTED[1] = 0;
+    self->pwm->EVENTS_STOPPED = 0;
+    self->pwm->SHORTS = NRF_PWM_SHORT_LOOPSDONE_SEQSTART0_MASK;
+    self->pwm->TASKS_SEQSTART[0] = 1;
+    self->playing = true;
+    self->stopping = false;
+    self->paused = false;
+}
+
+void common_hal_audiopwmio_pwmaudioout_stop(audiopwmio_pwmaudioout_obj_t* self) {
+    deactivate_audiopwmout_obj(self);
+    self->pwm->TASKS_STOP = 1;
+    self->stopping = false;
+    self->paused = false;
+
+    m_free(self->buffers[0]);
+    self->buffers[0] = NULL;
+
+    m_free(self->buffers[1]);
+    self->buffers[1] = NULL;
+}
+
+bool common_hal_audiopwmio_pwmaudioout_get_playing(audiopwmio_pwmaudioout_obj_t* self) {
+    if(!self->paused && self->pwm->EVENTS_STOPPED) {
+        self->playing = false;
+        self->pwm->EVENTS_STOPPED = 0;
+    }
+    return self->playing;
+}
+
+/* pause/resume present difficulties for the NRF PWM audio module.
+ *
+ * A PWM sequence can be stopped in its tracks by sending a TASKS_STOP event,
+ * but there's no way to pick up the sequence where it was stopped; you could
+ * start at the start of one of the two sequences, but especially for "single buffer"
+ * sample, this seems undesirable.
+ *
+ * Or, you can stop at the end of a sequence so that you don't duplicate anything
+ * when restarting, but again this is unsatisfactory for a "single buffer" sample.
+ *
+ * For now, I've taken the coward's way and left these methods unimplemented.
+ * Perhaps the way forward is to divide even "single buffer" samples into tasks of
+ * only a few ms long, so that they can be stopped/restarted quickly enough that it
+ * feels instant. (This also saves on memory, for long in-memory "single buffer"
+ * samples, since we have to locally take a resampled copy!)
+ */
+void common_hal_audiopwmio_pwmaudioout_pause(audiopwmio_pwmaudioout_obj_t* self) {
+    self->paused = true;
+    self->pwm->SHORTS = NRF_PWM_SHORT_SEQEND1_STOP_MASK;
+}
+
+void common_hal_audiopwmio_pwmaudioout_resume(audiopwmio_pwmaudioout_obj_t* self) {
+    self->paused = false;
+    self->pwm->SHORTS = NRF_PWM_SHORT_LOOPSDONE_SEQSTART0_MASK;
+    if (self->pwm->EVENTS_STOPPED) {
+        self->pwm->EVENTS_STOPPED = 0;
+        self->pwm->TASKS_SEQSTART[0] = 1;
+    }
+}
+
+bool common_hal_audiopwmio_pwmaudioout_get_paused(audiopwmio_pwmaudioout_obj_t* self) {
+    return self->paused;
+}
diff --git a/ports/nrf/common-hal/audiopwmio/PWMAudioOut.h b/ports/nrf/common-hal/audiopwmio/PWMAudioOut.h
new file mode 100644
index 000000000..8deff5d34
--- /dev/null
+++ b/ports/nrf/common-hal/audiopwmio/PWMAudioOut.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOPWM_AUDIOOUT_H
+#define MICROPY_INCLUDED_NRF_COMMON_HAL_AUDIOPWM_AUDIOOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    mp_obj_t *sample;
+    NRF_PWM_Type *pwm;
+    uint16_t *buffers[2];
+
+    uint16_t buffer_length;
+    uint16_t quiescent_value;
+    uint16_t scale;
+
+    uint8_t left_channel_number;
+    uint8_t right_channel_number;
+    uint8_t spacing;
+    uint8_t bytes_per_sample;
+
+    bool playing;
+    bool stopping;
+    bool paused;
+    bool loop;
+    bool signed_to_unsigned;
+    bool single_buffer;
+} audiopwmio_pwmaudioout_obj_t;
+
+void audiopwmout_reset(void);
+
+void audiopwmout_background(void);
+
+#endif
diff --git a/ports/nrf/common-hal/audiopwmio/__init__.c b/ports/nrf/common-hal/audiopwmio/__init__.c
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/ports/nrf/common-hal/audiopwmio/__init__.c
diff --git a/ports/nrf/common-hal/pulseio/PWMOut.c b/ports/nrf/common-hal/pulseio/PWMOut.c
index 5233c9adc..b827470d3 100644
--- a/ports/nrf/common-hal/pulseio/PWMOut.c
+++ b/ports/nrf/common-hal/pulseio/PWMOut.c
@@ -57,6 +57,12 @@ STATIC uint16_t pwm_seq[MP_ARRAY_SIZE(pwms)][CHANNELS_PER_PWM];
 
 static uint8_t never_reset_pwm[MP_ARRAY_SIZE(pwms)];
 
+STATIC int pwm_idx(NRF_PWM_Type *pwm) {
+    for(size_t i=0; i < MP_ARRAY_SIZE(pwms); i++)
+        if(pwms[i] == pwm) return i;
+    return -1;
+}
+
 void common_hal_pulseio_pwmout_never_reset(pulseio_pwmout_obj_t *self) {
     for(size_t i=0; i < MP_ARRAY_SIZE(pwms); i++) {
         NRF_PWM_Type* pwm = pwms[i];
@@ -133,29 +139,11 @@ bool convert_frequency(uint32_t frequency, uint16_t *countertop, nrf_pwm_clk_t *
     return false;
 }
 
-pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
-                                                    const mcu_pin_obj_t* pin,
-                                                    uint16_t duty,
-                                                    uint32_t frequency,
-                                                    bool variable_frequency) {
-
-    // We don't use the nrfx driver here because we want to dynamically allocate channels
-    // as needed in an already-enabled PWM.
-
-    uint16_t countertop;
-    nrf_pwm_clk_t base_clock;
-    if (frequency == 0 || !convert_frequency(frequency, &countertop, &base_clock)) {
-        return PWMOUT_INVALID_FREQUENCY;
-    }
-
-    self->pwm = NULL;
-    self->channel = CHANNELS_PER_PWM;    // out-of-range value.
-    bool pwm_already_in_use;
-    NRF_PWM_Type* pwm;
-    size_t pwm_index = 0;
-    for (; pwm_index < MP_ARRAY_SIZE(pwms); pwm_index++) {
-        pwm = pwms[pwm_index];
-        pwm_already_in_use = pwm->ENABLE & SPIM_ENABLE_ENABLE_Msk;
+NRF_PWM_Type *pwmout_allocate(uint16_t countertop, nrf_pwm_clk_t base_clock,
+        bool variable_frequency, int8_t *channel_out, bool *pwm_already_in_use_out) {
+    for (size_t pwm_index = 0; pwm_index < MP_ARRAY_SIZE(pwms); pwm_index++) {
+        NRF_PWM_Type *pwm = pwms[pwm_index];
+        bool pwm_already_in_use = pwm->ENABLE & SPIM_ENABLE_ENABLE_Msk;
         if (pwm_already_in_use) {
             if (variable_frequency) {
                 // Variable frequency requires exclusive use of a PWM, so try the next one.
@@ -168,28 +156,65 @@ pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
                 for (size_t chan = 0; chan < CHANNELS_PER_PWM; chan++) {
                     if (pwm->PSEL.OUT[chan] == 0xFFFFFFFF) {
                         // Channel is free.
-                        self->pwm = pwm;
-                        self->channel = chan;
-                        break;
+                        if(channel_out)
+                            *channel_out = chan;
+                        if(pwm_already_in_use_out)
+                            *pwm_already_in_use_out = pwm_already_in_use;
+                        return pwm;
                     }
                 }
-                // Did we find a channel? If not, loop and check the next pwm.
-                if (self->pwm != NULL) {
-                    break;
-                }
             }
         } else {
             // PWM not yet in use, so we can start to use it. Use channel 0.
-            self->pwm = pwm;
-            self->channel = 0;
-            break;
+            if(channel_out)
+                *channel_out = 0;
+            if(pwm_already_in_use_out)
+                *pwm_already_in_use_out = pwm_already_in_use;
+            return pwm;
         }
     }
+    return NULL;
+}
+
+void pwmout_free_channel(NRF_PWM_Type *pwm, int8_t channel) {
+    // Disconnect pin from channel.
+    pwm->PSEL.OUT[channel] = 0xFFFFFFFF;
+
+    for(int i=0; i < CHANNELS_PER_PWM; i++) {
+        if (pwm->PSEL.OUT[i] != 0xFFFFFFFF) {
+            // Some channel is still being used, so don't disable.
+            return;
+        }
+    }
+
+    nrf_pwm_disable(pwm);
+}
+
+pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
+                                                    const mcu_pin_obj_t* pin,
+                                                    uint16_t duty,
+                                                    uint32_t frequency,
+                                                    bool variable_frequency) {
+
+    // We don't use the nrfx driver here because we want to dynamically allocate channels
+    // as needed in an already-enabled PWM.
+
+    uint16_t countertop;
+    nrf_pwm_clk_t base_clock;
+    if (frequency == 0 || !convert_frequency(frequency, &countertop, &base_clock)) {
+        return PWMOUT_INVALID_FREQUENCY;
+    }
+
+    int8_t channel;
+    bool pwm_already_in_use;
+    self->pwm = pwmout_allocate(countertop, base_clock, variable_frequency,
+        &channel, &pwm_already_in_use);
 
     if (self->pwm == NULL) {
         return PWMOUT_ALL_TIMERS_IN_USE;
     }
 
+    self->channel = channel;
     self->pin_number = pin->number;
     claim_pin(pin);
 
@@ -200,17 +225,17 @@ pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
     nrf_gpio_cfg_output(self->pin_number);
 
     // disable before mapping pin channel
-    nrf_pwm_disable(pwm);
+    nrf_pwm_disable(self->pwm);
 
     if (!pwm_already_in_use) {
-        reset_single_pwmout(pwm_index);
-        nrf_pwm_configure(pwm, base_clock, NRF_PWM_MODE_UP, countertop);
+        reset_single_pwmout(pwm_idx(self->pwm));
+        nrf_pwm_configure(self->pwm, base_clock, NRF_PWM_MODE_UP, countertop);
     }
 
     // Connect channel to pin, without disturbing other channels.
-    pwm->PSEL.OUT[self->channel] = pin->number;
+    self->pwm->PSEL.OUT[self->channel] = pin->number;
 
-    nrf_pwm_enable(pwm);
+    nrf_pwm_enable(self->pwm);
 
     common_hal_pulseio_pwmout_set_duty_cycle(self, duty);
     return PWMOUT_OK;
@@ -230,17 +255,7 @@ void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
     NRF_PWM_Type* pwm = self->pwm;
     self->pwm = NULL;
 
-    // Disconnect pin from channel.
-    pwm->PSEL.OUT[self->channel] = 0xFFFFFFFF;
-
-    for(int i=0; i < CHANNELS_PER_PWM; i++) {
-        if (self->pwm->PSEL.OUT[i] != 0xFFFFFFFF) {
-            // Some channel is still being used, so don't disable.
-            return;
-        }
-    }
-
-    nrf_pwm_disable(pwm);
+    pwmout_free_channel(pwm, self->channel);
 }
 
 void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty_cycle) {
diff --git a/ports/nrf/common-hal/pulseio/PWMOut.h b/ports/nrf/common-hal/pulseio/PWMOut.h
index a4e58dc1a..b6798cb68 100644
--- a/ports/nrf/common-hal/pulseio/PWMOut.h
+++ b/ports/nrf/common-hal/pulseio/PWMOut.h
@@ -41,5 +41,8 @@ typedef struct {
 } pulseio_pwmout_obj_t;
 
 void pwmout_reset(void);
+NRF_PWM_Type *pwmout_allocate(uint16_t countertop, nrf_pwm_clk_t base_clock,
+    bool variable_frequency, int8_t *channel_out, bool *pwm_already_in_use_out);
+void pwmout_free_channel(NRF_PWM_Type *pwm, int8_t channel);
 
 #endif // MICROPY_INCLUDED_NRF_COMMON_HAL_PULSEIO_PWMOUT_H
diff --git a/ports/nrf/mpconfigport.mk b/ports/nrf/mpconfigport.mk
index 83166708a..57879bbaa 100644
--- a/ports/nrf/mpconfigport.mk
+++ b/ports/nrf/mpconfigport.mk
@@ -10,8 +10,10 @@ USB_SERIAL_NUMBER_LENGTH = 16
 # All nRF ports have longints.
 LONGINT_IMPL = MPZ
 
-# No DAC, so no regular audio.
+# Audio via PWM
+CIRCUITPY_AUDIOCORE = 1
 CIRCUITPY_AUDIOIO = 0
+CIRCUITPY_AUDIOPWMIO = 1
 
 # No I2S yet.
 CIRCUITPY_AUDIOBUSIO = 0
diff --git a/ports/nrf/supervisor/port.c b/ports/nrf/supervisor/port.c
index 8fbf75498..03f787624 100644
--- a/ports/nrf/supervisor/port.c
+++ b/ports/nrf/supervisor/port.c
@@ -50,6 +50,10 @@
 
 #include "shared-bindings/rtc/__init__.h"
 
+#ifdef CIRCUITPY_AUDIOPWMIO
+#include "common-hal/audiopwmio/PWMAudioOut.h"
+#endif
+
 static void power_warning_handler(void) {
     reset_into_safe_mode(BROWNOUT);
 }
@@ -94,6 +98,10 @@ void reset_port(void) {
     spi_reset();
     uart_reset();
 
+#ifdef CIRCUITPY_AUDIOPWMIO
+    audiopwmout_reset();
+#endif
+
 #if CIRCUITPY_PULSEIO
     pwmout_reset();
     pulseout_reset();
diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
index bdefc18cc..a6dde61da 100644
--- a/py/circuitpy_defns.mk
+++ b/py/circuitpy_defns.mk
@@ -108,6 +108,9 @@ endif
 ifeq ($(CIRCUITPY_AUDIOIO),1)
 SRC_PATTERNS += audioio/%
 endif
+ifeq ($(CIRCUITPY_AUDIOPWMIO),1)
+SRC_PATTERNS += audiopwmio/%
+endif
 ifeq ($(CIRCUITPY_AUDIOCORE),1)
 SRC_PATTERNS += audiocore/%
 endif
@@ -223,6 +226,8 @@ $(filter $(SRC_PATTERNS), \
 	audiobusio/__init__.c \
 	audiobusio/I2SOut.c \
 	audiobusio/PDMIn.c \
+	audiopwmio/__init__.c \
+	audiopwmio/PWMAudioOut.c \
 	audioio/__init__.c \
 	audioio/AudioOut.c \
 	bleio/__init__.c \
@@ -303,6 +308,7 @@ $(filter $(SRC_PATTERNS), \
 	_stage/Layer.c \
 	_stage/Text.c \
 	_stage/__init__.c \
+	audiopwmio/__init__.c \
 	audioio/__init__.c \
 	audiocore/__init__.c \
 	audiocore/Mixer.c \
diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h
index 3440eb052..d88d6538e 100644
--- a/py/circuitpy_mpconfig.h
+++ b/py/circuitpy_mpconfig.h
@@ -244,6 +244,13 @@ extern const struct _mp_obj_module_t audioio_module;
 #define AUDIOIO_MODULE
 #endif
 
+#if CIRCUITPY_AUDIOPWMIO
+#define AUDIOPWMIO_MODULE         { MP_OBJ_NEW_QSTR(MP_QSTR_audiopwmio), (mp_obj_t)&audiopwmio_module },
+extern const struct _mp_obj_module_t audiopwmio_module;
+#else
+#define AUDIOPWMIO_MODULE
+#endif
+
 #if CIRCUITPY_BITBANGIO
 #define BITBANGIO_MODULE       { MP_OBJ_NEW_QSTR(MP_QSTR_bitbangio), (mp_obj_t)&bitbangio_module },
 extern const struct _mp_obj_module_t bitbangio_module;
@@ -573,6 +580,7 @@ extern const struct _mp_obj_module_t ustack_module;
     AUDIOBUSIO_MODULE \
     AUDIOCORE_MODULE \
     AUDIOIO_MODULE \
+    AUDIOPWMIO_MODULE \
     BITBANGIO_MODULE \
     BLEIO_MODULE \
     BOARD_MODULE \
diff --git a/py/circuitpy_mpconfig.mk b/py/circuitpy_mpconfig.mk
index 772a1c3e1..a408cd7ac 100644
--- a/py/circuitpy_mpconfig.mk
+++ b/py/circuitpy_mpconfig.mk
@@ -74,9 +74,18 @@ CIRCUITPY_AUDIOIO = $(CIRCUITPY_FULL_BUILD)
 endif
 CFLAGS += -DCIRCUITPY_AUDIOIO=$(CIRCUITPY_AUDIOIO)
 
+ifndef CIRCUITPY_AUDIOPWMIO
+CIRCUITPY_AUDIOPWMIO = 0
+endif
+CFLAGS += -DCIRCUITPY_AUDIOPWMIO=$(CIRCUITPY_AUDIOPWMIO)
+
 ifndef CIRCUITPY_AUDIOCORE
+ifeq ($(CIRCUITPY_AUDIOPWMIO),1)
+CIRCUITPY_AUDIOCORE = $(CIRCUITPY_AUDIOPWMIO)
+else
 CIRCUITPY_AUDIOCORE = $(CIRCUITPY_AUDIOIO)
 endif
+endif
 CFLAGS += -DCIRCUITPY_AUDIOCORE=$(CIRCUITPY_AUDIOCORE)
 
 ifndef CIRCUITPY_BITBANGIO
diff --git a/shared-bindings/audiobusio/I2SOut.c b/shared-bindings/audiobusio/I2SOut.c
index 980f11392..9bce9c760 100644
--- a/shared-bindings/audiobusio/I2SOut.c
+++ b/shared-bindings/audiobusio/I2SOut.c
@@ -56,7 +56,7 @@
 //|   using `UDA1334 Breakout <https://www.adafruit.com/product/3678>`_::
 //|
 //|     import audiobusio
-//|     import audioio
+//|     import audiocore
 //|     import board
 //|     import array
 //|     import time
@@ -68,7 +68,7 @@
 //|     for i in range(length):
 //|         sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
 //|
-//|     sine_wave = audiobusio.RawSample(sine_wave, sample_rate=8000)
+//|     sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)
 //|     i2s = audiobusio.I2SOut(board.D1, board.D0, board.D9)
 //|     i2s.play(sine_wave, loop=True)
 //|     time.sleep(1)
@@ -78,12 +78,13 @@
 //|
 //|     import board
 //|     import audioio
+//|     import audiocore
 //|     import audiobusio
 //|     import digitalio
 //|
 //|
 //|     f = open("cplay-5.1-16bit-16khz.wav", "rb")
-//|     wav = audioio.WaveFile(f)
+//|     wav = audiocore.WaveFile(f)
 //|
 //|     a = audiobusio.I2SOut(board.D1, board.D0, board.D9)
 //|
@@ -163,7 +164,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audiobusio_i2sout___exit___obj, 4, 4,
 //|     Plays the sample once when loop=False and continuously when loop=True.
 //|     Does not block. Use `playing` to block.
 //|
-//|     Sample must be an `audioio.WaveFile` or `audioio.RawSample`.
+//|     Sample must be an `audiocore.WaveFile`, `audiocore.RawSample`, or `audiocore.Mixer`.
 //|
 //|     The sample itself should consist of 8 bit or 16 bit samples.
 //|
diff --git a/shared-bindings/audiocore/Mixer.c b/shared-bindings/audiocore/Mixer.c
index b2f0a3fda..9ab720434 100644
--- a/shared-bindings/audiocore/Mixer.c
+++ b/shared-bindings/audiocore/Mixer.c
@@ -36,7 +36,7 @@
 #include "shared-bindings/util.h"
 #include "supervisor/shared/translate.h"
 
-//| .. currentmodule:: audioio
+//| .. currentmodule:: audiocore
 //|
 //| :class:`Mixer` -- Mixes one or more audio samples together
 //| ===========================================================
@@ -54,15 +54,16 @@
 //|
 //|     import board
 //|     import audioio
+//|     import audiocore
 //|     import digitalio
 //|
 //|     # Required for CircuitPlayground Express
 //|     speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
 //|     speaker_enable.switch_to_output(value=True)
 //|
-//|     music = audioio.WaveFile(open("cplay-5.1-16bit-16khz.wav", "rb"))
-//|     drum = audioio.WaveFile(open("drum.wav", "rb"))
-//|     mixer = audioio.Mixer(voice_count=2, sample_rate=16000, channel_count=1, bits_per_sample=16, samples_signed=True)
+//|     music = audiocore.WaveFile(open("cplay-5.1-16bit-16khz.wav", "rb"))
+//|     drum = audiocore.WaveFile(open("drum.wav", "rb"))
+//|     mixer = audiocore.Mixer(voice_count=2, sample_rate=16000, channel_count=1, bits_per_sample=16, samples_signed=True)
 //|     a = audioio.AudioOut(board.A0)
 //|
 //|     print("playing")
@@ -151,7 +152,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_mixer___exit___obj, 4, 4, aud
 //|     Plays the sample once when loop=False and continuously when loop=True.
 //|     Does not block. Use `playing` to block.
 //|
-//|     Sample must be an `audioio.WaveFile`, `audioio.Mixer` or `audioio.RawSample`.
+//|     Sample must be an `audiocore.WaveFile`, `audiocore.RawSample`, or `audiocore.Mixer`.
 //|
 //|     The sample must match the Mixer's encoding settings given in the constructor.
 //|
diff --git a/shared-bindings/audiocore/RawSample.c b/shared-bindings/audiocore/RawSample.c
index 912b48bfb..07f8c683f 100644
--- a/shared-bindings/audiocore/RawSample.c
+++ b/shared-bindings/audiocore/RawSample.c
@@ -35,7 +35,7 @@
 #include "shared-bindings/audiocore/RawSample.h"
 #include "supervisor/shared/translate.h"
 
-//| .. currentmodule:: audioio
+//| .. currentmodule:: audiocore
 //|
 //| :class:`RawSample` -- A raw audio sample buffer
 //| ========================================================
@@ -55,6 +55,7 @@
 //|
 //|   Simple 8ksps 440 Hz sin wave::
 //|
+//|     import audiocore
 //|     import audioio
 //|     import board
 //|     import array
@@ -68,7 +69,7 @@
 //|         sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15))
 //|
 //|     dac = audioio.AudioOut(board.SPEAKER)
-//|     sine_wave = audioio.RawSample(sine_wave)
+//|     sine_wave = audiocore.RawSample(sine_wave)
 //|     dac.play(sine_wave, loop=True)
 //|     time.sleep(1)
 //|     dac.stop()
diff --git a/shared-bindings/audiocore/WaveFile.c b/shared-bindings/audiocore/WaveFile.c
index 4c1993b7c..edb190d3a 100644
--- a/shared-bindings/audiocore/WaveFile.c
+++ b/shared-bindings/audiocore/WaveFile.c
@@ -33,7 +33,7 @@
 #include "shared-bindings/util.h"
 #include "supervisor/shared/translate.h"
 
-//| .. currentmodule:: audioio
+//| .. currentmodule:: audiocore
 //|
 //| :class:`WaveFile` -- Load a wave file for audio playback
 //| ========================================================
@@ -50,6 +50,7 @@
 //|   Playing a wave file from flash::
 //|
 //|     import board
+//|     import audiocore
 //|     import audioio
 //|     import digitalio
 //|
@@ -58,7 +59,7 @@
 //|     speaker_enable.switch_to_output(value=True)
 //|
 //|     data = open("cplay-5.1-16bit-16khz.wav", "rb")
-//|     wav = audioio.WaveFile(data)
+//|     wav = audiocore.WaveFile(data)
 //|     a = audioio.AudioOut(board.A0)
 //|
 //|     print("playing")
diff --git a/shared-bindings/audioio/AudioOut.c b/shared-bindings/audioio/AudioOut.c
index 79df66f7d..af2fce48e 100644
--- a/shared-bindings/audioio/AudioOut.c
+++ b/shared-bindings/audioio/AudioOut.c
@@ -55,6 +55,7 @@
 //|
 //|   Simple 8ksps 440 Hz sin wave::
 //|
+//|     import audiocore
 //|     import audioio
 //|     import board
 //|     import array
@@ -68,7 +69,7 @@
 //|         sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
 //|
 //|     dac = audioio.AudioOut(board.SPEAKER)
-//|     sine_wave = audioio.RawSample(sine_wave, sample_rate=8000)
+//|     sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)
 //|     dac.play(sine_wave, loop=True)
 //|     time.sleep(1)
 //|     dac.stop()
@@ -84,7 +85,7 @@
 //|     speaker_enable.switch_to_output(value=True)
 //|
 //|     data = open("cplay-5.1-16bit-16khz.wav", "rb")
-//|     wav = audioio.WaveFile(data)
+//|     wav = audiocore.WaveFile(data)
 //|     a = audioio.AudioOut(board.A0)
 //|
 //|     print("playing")
@@ -162,7 +163,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_audioout___exit___obj, 4, 4,
 //|     Plays the sample once when loop=False and continuously when loop=True.
 //|     Does not block. Use `playing` to block.
 //|
-//|     Sample must be an `audioio.WaveFile` or `audioio.RawSample`.
+//|     Sample must be an `audiocore.WaveFile`, `audiocore.RawSample`, or `audiocore.Mixer`.
 //|
 //|     The sample itself should consist of 16 bit samples. Microcontrollers with a lower output
 //|     resolution will use the highest order bits to output. For example, the SAMD21 has a 10 bit
diff --git a/shared-bindings/audiopwmio/PWMAudioOut.c b/shared-bindings/audiopwmio/PWMAudioOut.c
new file mode 100644
index 000000000..92543d112
--- /dev/null
+++ b/shared-bindings/audiopwmio/PWMAudioOut.c
@@ -0,0 +1,294 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/binary.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/audiopwmio/PWMAudioOut.h"
+#include "shared-bindings/audiocore/RawSample.h"
+#include "shared-bindings/util.h"
+#include "supervisor/shared/translate.h"
+
+//| .. currentmodule:: audiopwmio
+//|
+//| :class:`PWMAudioOut` -- Output an analog audio signal
+//| ========================================================
+//|
+//| AudioOut can be used to output an analog audio signal on a given pin.
+//|
+//| .. class:: PWMAudioOut(left_channel, *, right_channel=None, quiescent_value=0x8000)
+//|
+//|   Create a PWMAudioOut object associated with the given pin(s). This allows you to
+//|   play audio signals out on the given pin(s).  In contrast to mod:`audioio`,
+//|   the pin(s) specified are digital pins, and are driven with a device-dependent PWM
+//|   signal.
+//|
+//|   :param ~microcontroller.Pin left_channel: The pin to output the left channel to
+//|   :param ~microcontroller.Pin right_channel: The pin to output the right channel to
+//|   :param int quiescent_value: The output value when no signal is present. Samples should start
+//|       and end with this value to prevent audible popping.
+//|
+//|   Simple 8ksps 440 Hz sin wave::
+//|
+//|     import audiocore
+//|     import audiopwmio
+//|     import board
+//|     import array
+//|     import time
+//|     import math
+//|
+//|     # Generate one period of sine wav.
+//|     length = 8000 // 440
+//|     sine_wave = array.array("H", [0] * length)
+//|     for i in range(length):
+//|         sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
+//|
+//|     dac = audiopwmio.PWMAudioOut(board.SPEAKER)
+//|     sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)
+//|     dac.play(sine_wave, loop=True)
+//|     time.sleep(1)
+//|     dac.stop()
+//|
+//|   Playing a wave file from flash::
+//|
+//|     import board
+//|     import audiocore
+//|     import audiopwmio
+//|     import digitalio
+//|
+//|     # Required for CircuitPlayground Express
+//|     speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
+//|     speaker_enable.switch_to_output(value=True)
+//|
+//|     data = open("cplay-5.1-16bit-16khz.wav", "rb")
+//|     wav = audiocore.WaveFile(data)
+//|     a = audiopwmio.PWMAudioOut(board.SPEAKER)
+//|
+//|     print("playing")
+//|     a.play(wav)
+//|     while a.playing:
+//|       pass
+//|     print("stopped")
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_left_channel, ARG_right_channel, ARG_quiescent_value };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_left_channel, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_right_channel, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_rom_obj = mp_const_none} },
+        { MP_QSTR_quiescent_value, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 0x8000} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_obj_t left_channel_obj = args[ARG_left_channel].u_obj;
+    assert_pin(left_channel_obj, false);
+    const mcu_pin_obj_t *left_channel_pin = MP_OBJ_TO_PTR(left_channel_obj);
+
+    mp_obj_t right_channel_obj = args[ARG_right_channel].u_obj;
+    const mcu_pin_obj_t *right_channel_pin = NULL;
+    if (right_channel_obj != mp_const_none) {
+        assert_pin(right_channel_obj, false);
+        right_channel_pin = MP_OBJ_TO_PTR(right_channel_obj);
+    }
+
+    // create AudioOut object from the given pin
+    audiopwmio_pwmaudioout_obj_t *self = m_new_obj(audiopwmio_pwmaudioout_obj_t);
+    self->base.type = &audiopwmio_pwmaudioout_type;
+    common_hal_audiopwmio_pwmaudioout_construct(self, left_channel_pin, right_channel_pin, args[ARG_quiescent_value].u_int);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the PWMAudioOut and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_deinit(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_audiopwmio_pwmaudioout_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_deinit_obj, audiopwmio_pwmaudioout_deinit);
+
+STATIC void check_for_deinit(audiopwmio_pwmaudioout_obj_t *self) {
+    if (common_hal_audiopwmio_pwmaudioout_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context. See
+//|      :ref:`lifetime-and-contextmanagers` for more info.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_audiopwmio_pwmaudioout_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audiopwmio_pwmaudioout___exit___obj, 4, 4, audiopwmio_pwmaudioout_obj___exit__);
+
+
+//|   .. method:: play(sample, *, loop=False)
+//|
+//|     Plays the sample once when loop=False and continuously when loop=True.
+//|     Does not block. Use `playing` to block.
+//|
+//|     Sample must be an `audiocore.WaveFile`, `audiocore.RawSample`, or `audiocore.Mixer`.
+//|
+//|     The sample itself should consist of 16 bit samples. Microcontrollers with a lower output
+//|     resolution will use the highest order bits to output. For example, the SAMD21 has a 10 bit
+//|     DAC that ignores the lowest 6 bits when playing 16 bit samples.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_play(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_sample, ARG_loop };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_sample,    MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_loop,      MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = false} },
+    };
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_obj_t sample = args[ARG_sample].u_obj;
+    common_hal_audiopwmio_pwmaudioout_play(self, sample, args[ARG_loop].u_bool);
+
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(audiopwmio_pwmaudioout_play_obj, 1, audiopwmio_pwmaudioout_obj_play);
+
+//|   .. method:: stop()
+//|
+//|     Stops playback and resets to the start of the sample.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_stop(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    common_hal_audiopwmio_pwmaudioout_stop(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_stop_obj, audiopwmio_pwmaudioout_obj_stop);
+
+//|   .. attribute:: playing
+//|
+//|     True when an audio sample is being output even if `paused`. (read-only)
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_get_playing(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return mp_obj_new_bool(common_hal_audiopwmio_pwmaudioout_get_playing(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_get_playing_obj, audiopwmio_pwmaudioout_obj_get_playing);
+
+const mp_obj_property_t audiopwmio_pwmaudioout_playing_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audiopwmio_pwmaudioout_get_playing_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. method:: pause()
+//|
+//|     Stops playback temporarily while remembering the position. Use `resume` to resume playback.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_pause(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+
+    if (!common_hal_audiopwmio_pwmaudioout_get_playing(self)) {
+        mp_raise_RuntimeError(translate("Not playing"));
+    }
+    common_hal_audiopwmio_pwmaudioout_pause(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_pause_obj, audiopwmio_pwmaudioout_obj_pause);
+
+//|   .. method:: resume()
+//|
+//|     Resumes sample playback after :py:func:`pause`.
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_resume(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+
+    if (common_hal_audiopwmio_pwmaudioout_get_paused(self)) {
+        common_hal_audiopwmio_pwmaudioout_resume(self);
+    }
+
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_resume_obj, audiopwmio_pwmaudioout_obj_resume);
+
+//|   .. attribute:: paused
+//|
+//|     True when playback is paused. (read-only)
+//|
+STATIC mp_obj_t audiopwmio_pwmaudioout_obj_get_paused(mp_obj_t self_in) {
+    audiopwmio_pwmaudioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return mp_obj_new_bool(common_hal_audiopwmio_pwmaudioout_get_paused(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audiopwmio_pwmaudioout_get_paused_obj, audiopwmio_pwmaudioout_obj_get_paused);
+
+const mp_obj_property_t audiopwmio_pwmaudioout_paused_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audiopwmio_pwmaudioout_get_paused_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC const mp_rom_map_elem_t audiopwmio_pwmaudioout_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audiopwmio_pwmaudioout_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audiopwmio_pwmaudioout___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_play), MP_ROM_PTR(&audiopwmio_pwmaudioout_play_obj) },
+    { MP_ROM_QSTR(MP_QSTR_stop), MP_ROM_PTR(&audiopwmio_pwmaudioout_stop_obj) },
+    { MP_ROM_QSTR(MP_QSTR_pause), MP_ROM_PTR(&audiopwmio_pwmaudioout_pause_obj) },
+    { MP_ROM_QSTR(MP_QSTR_resume), MP_ROM_PTR(&audiopwmio_pwmaudioout_resume_obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_playing), MP_ROM_PTR(&audiopwmio_pwmaudioout_playing_obj) },
+    { MP_ROM_QSTR(MP_QSTR_paused), MP_ROM_PTR(&audiopwmio_pwmaudioout_paused_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(audiopwmio_pwmaudioout_locals_dict, audiopwmio_pwmaudioout_locals_dict_table);
+
+const mp_obj_type_t audiopwmio_pwmaudioout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PWMAudioOut,
+    .make_new = audiopwmio_pwmaudioout_make_new,
+    .locals_dict = (mp_obj_dict_t*)&audiopwmio_pwmaudioout_locals_dict,
+};
diff --git a/shared-bindings/audiopwmio/PWMAudioOut.h b/shared-bindings/audiopwmio/PWMAudioOut.h
new file mode 100644
index 000000000..22afc70d3
--- /dev/null
+++ b/shared-bindings/audiopwmio/PWMAudioOut.h
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO_AUDIOOUT_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO_AUDIOOUT_H
+
+#include "common-hal/audiopwmio/PWMAudioOut.h"
+#include "common-hal/microcontroller/Pin.h"
+#include "shared-bindings/audiocore/RawSample.h"
+
+extern const mp_obj_type_t audiopwmio_pwmaudioout_type;
+
+// left_channel will always be non-NULL but right_channel may be for mono output.
+void common_hal_audiopwmio_pwmaudioout_construct(audiopwmio_pwmaudioout_obj_t* self,
+    const mcu_pin_obj_t* left_channel, const mcu_pin_obj_t* right_channel, uint16_t default_value);
+
+void common_hal_audiopwmio_pwmaudioout_deinit(audiopwmio_pwmaudioout_obj_t* self);
+bool common_hal_audiopwmio_pwmaudioout_deinited(audiopwmio_pwmaudioout_obj_t* self);
+void common_hal_audiopwmio_pwmaudioout_play(audiopwmio_pwmaudioout_obj_t* self, mp_obj_t sample, bool loop);
+void common_hal_audiopwmio_pwmaudioout_stop(audiopwmio_pwmaudioout_obj_t* self);
+bool common_hal_audiopwmio_pwmaudioout_get_playing(audiopwmio_pwmaudioout_obj_t* self);
+void common_hal_audiopwmio_pwmaudioout_pause(audiopwmio_pwmaudioout_obj_t* self);
+void common_hal_audiopwmio_pwmaudioout_resume(audiopwmio_pwmaudioout_obj_t* self);
+bool common_hal_audiopwmio_pwmaudioout_get_paused(audiopwmio_pwmaudioout_obj_t* self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO_AUDIOOUT_H
diff --git a/shared-bindings/audiopwmio/__init__.c b/shared-bindings/audiopwmio/__init__.c
new file mode 100644
index 000000000..8a2b202b3
--- /dev/null
+++ b/shared-bindings/audiopwmio/__init__.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/audiopwmio/__init__.h"
+#include "shared-bindings/audiopwmio/PWMAudioOut.h"
+
+//| :mod:`audiopwmio` --- Support for audio input and output
+//| ========================================================
+//|
+//| .. module:: audiopwmio
+//|   :synopsis: Support for audio output via digital PWM
+//|   :platform: NRF52
+//|
+//| The `audiopwmio` module contains classes to provide access to audio IO.
+//|
+//| Libraries
+//|
+//| .. toctree::
+//|     :maxdepth: 3
+//|
+//|     PWMAudioOut
+//|
+//| All classes change hardware state and should be deinitialized when they
+//| are no longer needed if the program continues after use. To do so, either
+//| call :py:meth:`!deinit` or use a context manager. See
+//| :ref:`lifetime-and-contextmanagers` for more info.
+//|
+//| Since CircuitPython 5, `Mixer`, `RawSample` and `WaveFile` are moved
+//| to :mod:`audiocore`.
+//|
+
+STATIC const mp_rom_map_elem_t audiopwmio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_audiopwmio) },
+    { MP_ROM_QSTR(MP_QSTR_PWMAudioOut), MP_ROM_PTR(&audiopwmio_pwmaudioout_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(audiopwmio_module_globals, audiopwmio_module_globals_table);
+
+const mp_obj_module_t audiopwmio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&audiopwmio_module_globals,
+};
diff --git a/shared-bindings/audiopwmio/__init__.h b/shared-bindings/audiopwmio/__init__.h
new file mode 100644
index 000000000..e4b7067d1
--- /dev/null
+++ b/shared-bindings/audiopwmio/__init__.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
diff --git a/shared-module/audiocore/WaveFile.h b/shared-module/audiocore/WaveFile.h
index 97dd6a46f..3eecbf15c 100644
--- a/shared-module/audiocore/WaveFile.h
+++ b/shared-module/audiocore/WaveFile.h
@@ -27,6 +27,7 @@
 #ifndef MICROPY_INCLUDED_SHARED_MODULE_AUDIOIO_WAVEFILE_H
 #define MICROPY_INCLUDED_SHARED_MODULE_AUDIOIO_WAVEFILE_H
 
+#include "extmod/vfs_fat.h"
 #include "py/obj.h"
 
 #include "shared-module/audiocore/__init__.h"
diff --git a/shared-module/audiopwmio/__init__.c b/shared-module/audiopwmio/__init__.c
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/shared-module/audiopwmio/__init__.c
diff --git a/shared-module/audiopwmio/__init__.h b/shared-module/audiopwmio/__init__.h
new file mode 100644
index 000000000..964e4aafe
--- /dev/null
+++ b/shared-module/audiopwmio/__init__.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_MODULE_AUDIOPWMIO__INIT__H
+#define MICROPY_INCLUDED_SHARED_MODULE_AUDIOPWMIO__INIT__H
+
+#include "shared-module/audiocore/__init__.h"
+
+#endif  // MICROPY_INCLUDED_SHARED_MODULE_AUDIOPWMIO__INIT__H